Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien nhanh » hien hanh, thien thanh, tien thanh
cua truong » cua trung, xuan truong, cac truong
chuong dan » huong dan, chuong han, chuong dong
hien xanh » hien hanh, chieu xanh, hien khanh
cua trong » cua trung, qua trong, ca trong
dan toan » van toan, dan than, manh toan
toan ban » van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien xanh) or (hien nhanh)) - thanh trung ((cua trong) OR (cua truong)) chuong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien nhanh)) - thanh trung ((cua trong) OR (cua truong)) chuong dan toan ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hien nhanh)) - thanh trung ((cua trong) OR (cua truong)) chuong dan toan ban*".